ZX Next Clones
From SpecNext Wiki
The core of the Spectrum Next hardware is licensed under the GPL 3 free software license which has enabled the production of several compatible clone machines including:
N-Go - The N-Go is a full ZX Next clone complete with 2 Mega Drive style joystick ports, an expansion port and optional custom case.
Xberry Pi - an affordable Next clone with a PCB roughly the same dimensions as a Raspbery Pi 3.
ZX-DOS - FPGA-based hardware recreation of the ZX Spectrum, created by Antonio Villena.
ZXN core for MiSTer - A port of the Spectrum Next core to the MiSTer platform.
ZXTRES - The ZXTRES, ZXTRES+ and ZXTRES++ are Next clones with several alternative cores.ZXTRES wiki.
ZX-UNO - A Next clone in a Raspberry Pi form factor with composite video output.